Physical changes are often accompanied by changes in color or odor.

Answer;

The above statement is False

Explanation; Physical changes are types of changes that only change the appearance of a substance and not its chemical composition. Chemical change on the other hand is a type of change that cause a substance to change into an entirely new substance.Many physical changes are reversible, whereas chemical changes are usually irreversible or only reversible with an additional chemical change. Physical changes occur when a substance is melted, condensed, boiled, sublimated or deposited.

False. The odor would actually deal with chemical changes, so it would only be the appearance (aka color, etc) 

The correct answer is "hydrogen".